Question

我有以下查询：

SELECT  o.OrderNumber,
    cast(o.DateOrdered as datetime),
    cast(oi.Category as varchar(max))

 FROM   Orders o
    LEFT OUTER JOIN OrderItems oi ON oi.OrderID = o.uid
    LEFT OUTER JOIN OrderAddresses oa ON oa.OrderID = o.uid

 WHERE O.DateOrdered LIKE '6%2011%' AND (oa.Type = '4') AND (oa.Country = 'US')

 GROUP BY cast(oi.Category as varchar(max)), cast(o.DateOrdered as datetime), o.OrderNumber

我无法将datetime格式化为mm/dd/yyyy。无论我尝试过什么，我都会像YYYY-MM-DD 00:00:00:000一样。我必须在语法中忽略一些简单的东西，希望有人能指出我正确的方向吗？（SQL Server 2005）

谢谢！

Answer 1

尝试使用CONVERT代替CAST：

CONVERT(VARCHAR(10), o.DateOrdered , 101)

所以GROUP BY语句看起来像：

GROUP BY CAST(oi.Category as varchar(MAX)), CONVERT(VARCHAR(10), o.DateOrdered , 101), o.OrderNumber

Answer 2

CAST只会转换数据类型 - 但它不能让您选择任何格式。

要进行格式化，您需要使用CONVERT代替（有关详细信息，请参阅MSDN Books Online）：

尝试

SELECT CONVERT(VARCHAR(25), GETDATE(), 101)

应该以您正在寻找的格式呈现当前日期。

Answer 3

看起来DateOrdered是VARCHAR

请尝试

SELECT  o.OrderNumber,
    CONVERT(VARCHAR(25),cast(o.DateOrdered as datetime), 101),
    cast(oi.Category as varchar(max))

 FROM   Orders o
    LEFT OUTER JOIN OrderItems oi ON oi.OrderID = o.uid
    LEFT OUTER JOIN OrderAddresses oa ON oa.OrderID = o.uid

 WHERE O.DateOrdered LIKE '6%2011%' AND (oa.Type = '4') AND (oa.Country = 'US')

 GROUP BY cast(oi.Category as varchar(max)), CONVERT(VARCHAR(25),cast(o.DateOrdered as datetime), 101), o.OrderNumber

SQL Server字符串到日期转换

3 个答案: